Download SMOOTH ENDOPLASMIC RETICULUM

SMOOTH
ENDOPLASMIC
RETICULUM
Prepared by:
Jomar M. Urbano
2SED-SC
Ms. Aimie M. Aquino
Professor
S.E.R.
Learning Objectives:
Describe
Smooth
Endoplasmic Reticulum (SER)
in terms of structure.
Functions of Smooth
Endoplasmic Reticulum
S.E.R.
Introduction
The
Smooth
Endoplasmic
Reticulum (SER) is seen as a
tangle
of
interconnected
tubules.
Unlike the rough ER, it lacks
ribosomes
or
relatively
few
ribosomes attached.
The
smooth ER is continuous with
the rough ER but has different
functions and structure.
S.E.R.
STRUCTURE
S.E.R.
STRUCTURE
S.E.R.
Smooth Endoplasmic Reticulum
 Name:
smooth endoplasmic reticulum,
smooth ER, tubular endoplasmic
reticulum, agranular endoplasmic
reticulum
 Location: in cytoplasm
 Appearance: interconnected and
branching tubules; relatively few/no
ribosomes
 Size: tubules are about 150nm in
diameter (variable)
S.E.R.
FUNCTIONS
Stores/Regulation
of calcium ions
Drug detoxification
Carbohydrate metabolism
Synthesis of steroids and lipids
Transportation of newly
synthesized proteins
S.E.R.
Stores/Regulation of calcium ions
In
case of muscle cells, this
endoplasmic
reticulum
stores calcium, which is
released
during
contraction of the muscles.
S.E.R.
Detoxification
The
SER is highly developed in liver
cells and has the function of
detoxification.
Any
substance carried in the
circulation can be rapidly acted on
by the liver where the metabolism or
“elimination” of lipophilic substances
such
as
drugs,
anesthetics,
pesticides, toxins, and hormones
takes place .
S.E.R.
Carbohydrate Metabolism
Liver
cells store carbohydrates in
the form of glycogen.
The breakdown of
glycogen eventually leads to the
release of glucose from the liver
cells, which is important in the
regulation of sugar concentration
in the blood.
S.E.R.
Synthesis of steroids and lipids
Enzymes
of the smooth ER
are vital to the synthesis of
lipids,
including oils, phospholipids
, and steroids.
S.E.R.
Transportation of newly
synthesized proteins
 Another
function is transportation of
newly synthesized proteins to other
locations in the cell or outside the cell.
 This is achieved through a process
called budding, wherein the small
vesicles, which contain proteins, are
detached
from
the
smooth
endoplasmic reticulum and are
carried to other locations.
S.E.R.
 END 
REFERENCE:
http://www.buzzle.com/articles/smoothendoplasmic-reticulum.html
http://www.en.wikipedia.org/wiki/Endomembran
e_system